Thousands of patriots are contributing to a fund started by a veteran to build the wall. Called "We the people will build the wall" the fund hopes to raise $1 Billion, which is the limit for a GoFundMe account. I expect there will be a follow-on to raise the other billions. The money raised this way bypasses the Washington Deep State and Congress.

Predictably, those who favor Open Borders are in a tizzy.
https://www.nytimes.com/2018/12/21/us/gofundme-wall-border-border-mexico.html

A secure border is vital for our national security and for the safety and health of our children.